Ordinary D.C Power Supply

Ordinary D.C Power Supply

1. ·

   • Rectifier
     • The output from the rectifier is pulsating DC
       • These pulsations are due to the presence of a.c. component in the rectifier output.
   • Filter circuit
     • The filter circuit removes the a.c. component so that steady d.c. voltage is obtained across the load.

2. Important terms

   • Voltage regulation.
     • The d.c.voltage available across the output terminals of a given power supply depends upon load current.
       • If the load current Idc Is increased
         • There is greater voltage drop in the power supply and hence smaller d.c. output voltage will be avail- able.
       • if the load current decreases.
         • The variation of output voltage w.r.t. the amount of load current drawn from the power supply is known as voltage regulation and is expressed by the following relation
   • Load regulation
     • indicates the change in output voltage due to the change in load current.
   • Line regulation
     • indicates the change in output voltage due to the change in input voltage.
   • Minimum load resistance
     • In order that a power supply gives the rated output voltage and current, there is minimum load resistance allowed. For instance, if a power supply is required to deliver a full-load current IFL at full-load voltage VFL, then,

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